GENERAL KNOWLEDGE

Detailed explanation-1: -When length of capillary tube is insufficient then we would observe no rise on level of water because their will be no air pressure created enough to rise the water level.

Detailed explanation-2: -If we replace a capillary tube with a pipe of insufficient length then water will not rise in the tube. So this pipe which is being replaced by the capillary tube will not work as a capillary tube at all because it will not perform the capillarity that is capillary action due to its insufficient length.

Detailed explanation-3: -If capillary is of insufficient length above the liquid level, the liquid rises upto the top of capillary and its surface acquires a new shape having a large radius of curvature.

Detailed explanation-4: -So the rise of a liquid in a capillary tube depends on surface tension of liquid, contact angle, density of liquid and inner radius of capillary.

Detailed explanation-5: -The rise of a liquid in a capillary tube is due to surface tension. It is called capillary action. The liquid rises into the a capillary tube to such a height that the weight of resulting liquid column is just balanced by the force of surface tension.